Homework 3 (due:May 27th) Deadline : May 27th 11:59pm Where to submit? eClass 과제방 (http://eclass.cau.ac.kr) How to submit? Create a folder. The name of the folder should be “studentID#.hw3”. (ex) 20111499.hw2 We have three problems in hw3. Make three C source files. The name of the source files should be the format “studentID#.hw2.#.c” (ex) 20111499.hw3.3.c , 20111499.hw3.3.c , …, 20111499.hw3.3.c In each source file .c, your code must have comments that include your name and student_id# Put the source files into the folder we created. Compress the folder into a zip file. The name of the zip file should be “student#.hw3.zip”. (ex) 20111499.hw3.zip Upload the zip file into eClass website. If you don’t follow above instructions, you may get penalty in your score. You must do programming yourself.

1. [Standard Deviation] Write a program that gets an arbitrary number of positive float values until -1 is received from a keyboard (standard input) and print the mean and the standard deviation of the positive float values. Please use following formula for computing the standard deviation : standard deviation: : mean You may assume that input size N is less than 10000 meaning you may get up to 10000 input numbers.

2. [Random Number] Write a program that simulates the rolling of two dice. The program should use rand() to roll the first die, and should use rand() again to roll the second die. The sum of the two values should then be calculated. [Note: Since each die can show an integer value from 1 to 6, then the sum of the two values will vary from 2 to 12, with 7 being the most frequent sum and 2 and 12 the least frequent sums.] Your program should roll the two dice 36,000 times and print the number of cases among 36,000 and probability for each sum value. The result of your program should look similar to the following output example (exact number may be different).

Input example output example 3. [Ladder Game] Consider a ladder game we often do in our daily life. The ladder is represented as N vertical lines and M horizontal lines where each horizontal line connects points on two vertical lines, as shown in the figure below. Write a program that prints the final point number that are connected with each starting point as shown in input/output example Input type: In first line, number of vertical lines N (N<=10) should be given. In second line, number of horizontal lines M (M<=50) should be given. From next lines, a sequence of horizontal lines should be given in up-to-down order. Input example 5 4 1 3 3 4 2 5 2 3 output example 4 5 1 2 3